This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A190877 #19 Feb 25 2022 12:10:13
%S A190877 1,1,1,1,1,121,721,2521,6721,15121,1844641,20013841,119845441,
%T A190877 519072841,1816454641,223394731561,3501661887361,29675906201761,
%U A190877 177923109591361,844925253766561,104750282797418881
%N A190877 Expansion of e.g.f. exp(x+x^5).
%H A190877 Seiichi Manyama, <a href="/A190877/b190877.txt">Table of n, a(n) for n = 0..510</a>
%F A190877 a(n) = n! * Sum_{j=0..n/4} binomial(n+(-4)*j,j)/(n+(-4)*j)!.
%F A190877 a(n) = a(n-1) + 5! * binomial(n-1,4) * a(n-5) for n > 4. - _Seiichi Manyama_, Feb 25 2022
%t A190877 With[{nn=30},CoefficientList[Series[Exp[x+x^5],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jan 25 2015 *)
%o A190877 (Maxima) a(n):=n!*sum(binomial(n+(-4)*j,j)/(n+(-4)*j)!,j,0,n/4);
%o A190877 (PARI) a(n) = if(n<5, 1, a(n-1)+5!*binomial(n-1, 4)*a(n-5)); \\ _Seiichi Manyama_, Feb 25 2022
%Y A190877 Cf. A047974, A118395, A190875.
%K A190877 nonn
%O A190877 0,6
%A A190877 _Vladimir Kruchinin_, May 23 2011